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package common
import (
"errors"
"fmt"
"io/ioutil"
"net/url"
"strings"
"gopkg.in/src-d/go-git.v2/formats/pktline"
"gopkg.in/src-d/go-git.v2/internal"
"gopkg.in/sourcegraph/go-vcsurl.v1"
)
var (
NotFoundErr = errors.New("repository not found")
)
const GitUploadPackServiceName = "git-upload-pack"
type Endpoint string
func NewEndpoint(url string) (Endpoint, error) {
vcs, err := vcsurl.Parse(url)
if err != nil {
return "", NewPermanentError(err)
}
link := vcs.Link()
if !strings.HasSuffix(link, ".git") {
link += ".git"
}
return Endpoint(link), nil
}
func (e Endpoint) Service(name string) string {
return fmt.Sprintf("%s/info/refs?service=%s", e, name)
}
// Capabilities contains all the server capabilities
// https://github.com/git/git/blob/master/Documentation/technical/protocol-capabilities.txt
type Capabilities map[string][]string
func parseCapabilities(line string) Capabilities {
values, _ := url.ParseQuery(strings.Replace(line, " ", "&", -1))
return Capabilities(values)
}
// Supports returns true if capability is preent
func (r Capabilities) Supports(capability string) bool {
_, ok := r[capability]
return ok
}
// Get returns the values for a capability
func (r Capabilities) Get(capability string) []string {
return r[capability]
}
// SymbolicReference returns the reference for a given symbolic reference
func (r Capabilities) SymbolicReference(sym string) string {
if !r.Supports("symref") {
return ""
}
for _, symref := range r.Get("symref") {
parts := strings.Split(symref, ":")
if len(parts) != 2 {
continue
}
if parts[0] == sym {
return parts[1]
}
}
return ""
}
type RemoteHead struct {
Id internal.Hash
Name string
}
type GitUploadPackInfo struct {
Capabilities Capabilities
Refs map[string]*RemoteHead
}
func NewGitUploadPackInfo(d *pktline.Decoder) (*GitUploadPackInfo, error) {
info := &GitUploadPackInfo{}
if err := info.read(d); err != nil {
return nil, NewUnexpectedError(err)
}
return info, nil
}
func (r *GitUploadPackInfo) read(d *pktline.Decoder) error {
lines, err := d.ReadAll()
if err != nil {
return err
}
r.Refs = map[string]*RemoteHead{}
for _, line := range lines {
if !r.isValidLine(line) {
continue
}
if r.Capabilities == nil {
r.Capabilities = parseCapabilities(line)
continue
}
r.readLine(line)
}
return nil
}
func (r *GitUploadPackInfo) isValidLine(line string) bool {
if line[0] == '#' {
return false
}
return true
}
func (r *GitUploadPackInfo) readLine(line string) {
rh := r.getRemoteHead(line)
r.Refs[rh.Name] = rh
}
func (r *GitUploadPackInfo) getRemoteHead(line string) *RemoteHead {
parts := strings.Split(strings.Trim(line, " \n"), " ")
if len(parts) != 2 {
return nil
}
return &RemoteHead{internal.NewHash(parts[0]), parts[1]}
}
type GitUploadPackRequest struct {
Want []internal.Hash
Have []internal.Hash
}
func (r *GitUploadPackRequest) String() string {
b, _ := ioutil.ReadAll(r.Reader())
return string(b)
}
func (r *GitUploadPackRequest) Reader() *strings.Reader {
e := pktline.NewEncoder()
for _, want := range r.Want {
e.AddLine(fmt.Sprintf("want %s", want))
}
for _, have := range r.Have {
e.AddLine(fmt.Sprintf("have %s", have))
}
e.AddFlush()
e.AddLine("done")
return e.Reader()
}
type PermanentError struct {
err error
}
func NewPermanentError(err error) *PermanentError {
if err == nil {
return nil
}
return &PermanentError{err: err}
}
func (e *PermanentError) Error() string {
return fmt.Sprintf("permanent client error: %s", e.err.Error())
}
type UnexpectedError struct {
err error
}
func NewUnexpectedError(err error) *UnexpectedError {
if err == nil {
return nil
}
return &UnexpectedError{err: err}
}
func (e *UnexpectedError) Error() string {
return fmt.Sprintf("unexpected client error: %s", e.err.Error())
}
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